Company:  NORTHERN TRUST CORP (NTRS)
Form Type:  8-K
Filing Date:  5/1/2009 
CIK:  0000073124 
Address:  50 S LASALLE ST 
City, State, Zip:  CHICAGO, Illinois 60603 
Telephone:  (312) 630-6000 
Fiscal Year:  12/31 
Last Trade
Last Trade: 
$47.24   		Change: 
-0.43 (-0.90%)  
Trade Time: 
Nov 20   		Market Cap: 
$11.41B
Description of Business
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  FORM 8-K
    SECTION 1 BUSINESS AND OPERATIONS
      Item 1.01 Entry into a Material Definitive Agreement.
    SECTION 9 FINANCIAL STATEMENTS AND EXHIBITS
      Item 9.01 Financial Statements and Exhibits.
    SIGNATURES
    EXHIBIT INDEX
  EXHIBIT 1.1
    Signature Page for Underwriting Agreement (Equity)
    Issuer General Use Free Writing Prospectus(es)
  EXHIBIT 1.2
    Signature Page for Underwriting Agreement (Debt)
  EXHIBIT 4
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